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This thing has been in operation 8 yrs! Unit took a dump giving a code 44 meaning control board but turned out to be just a bad stat. Meanwhile, she asks me what is going on with the wall. I go inside and trace the pipes. Yep, they crossed. Never tripped the pressure switch, flame rollout of limit. Still trying to figure out why they sold and install a power vented WH alongside this when this boiler could have done double duty. This boiler is oversized anyway (surprise, huh?).

FYI, the oil tank is still connected and contains fuel oil. She refuses to remove it and the hacks who installed this left the old coal burner boiler standing in the middle of the room.

The stainless steel side screws on this vent termination are all corroded from the acidic condensation. Still trying to figure out why this high end boiler and PV WH on this house for a client with a low budget. A buddy of mine shares an apartment here but was stuck in New England doing some TDY work for a client on their vacation home so I had to pinch hit for him on this one. No one ever noticed the exhaust was not a plume discharging out away from the building but instead the wall was dripping wet and sloughing off.

The wall was typical hardcoat stucco applied over CMU block then painted. Aside from the fact you never want to paint masonry because it hastens the death of the wall by trapping moisture inside, the acidic condensate ate through the paint then attacked the alkaline masonry. Agree, a metal wall would have been gone in months.

The Food Stamp Program, administered by the U.S. Department of Agriculture, is proud to be distributing the greatest amount of free meals and stamps EVER.
Meanwhile, the National Park Service, administered by the U.S. Department of the Interior, asks us to "Please Do Not Feed the Animals". Their stated reason for this policy "... the animals become dependent on handouts and will not learn to take care of themselves."
from an excerpt by Paul Jacob in Sun City, AZ

If you look at figure 14 on page 18 it shows the sidewall venting. If you follow the diagram, the exhaust goes out the round "nozzle". That is what all the drawings show the clearances measured to. It should form a plume of condensation out from the wall instead of fogging against the wall.

Even though I've never seen a side wall termination in person, and besides Pulse furnaces back when I used to work for Lennox dealers, have only seen 6 condensing appliances in the wild, I could tell what was wrong with that in just a couple of seconds.

Even though I've never seen a side wall termination in person, and besides Pulse furnaces back when I used to work for Lennox dealers, have only seen 6 condensing appliances in the wild, I could tell what was wrong with that in just a couple of seconds.

That's my point Mark. This thing has been installed for EIGHT YRS! Nobody has said boo! about it. The homeowner noted the wall damage yet nobody checked it. Yes, it has had service a few times.

To the defense of the installers, there are no visible markings on this termination indicating the In and Out. Still, use your head, think and look at the directions. I've been there where you have to work out the final fit as the pipes must be trimmed to a close tolerance, whether this or for instance a Bayvent on a Trane, it's still planning, thinking and paying attention to what you are doing. God forbid anyone would do a final walk around inspection much less use a combustion analyzer.

After I went to bed, I thought "I assumed they put it on the correct side of that black piece" .
So this happened because they put the exhaust in the intake which makes it hit the plastic and flow back against the wall.